This concept is interesting, to say the least, but it is really hard to think about what the player could think and implement it. I couldn't progress past the tutorial key because none of the lighting methods that I tried worked. The eyes on the title screen were not that well handled. They could be easily overlapped if the mouse hovers over the face of the character. The ideia is incredible, but it is really hard to execute it. Good job on making the game, though!
I'd be glad if you could try out my game, too!